Garnet – Grossular

Group: Silicates – neosilicates

Chemical composition: Ca3Al2(SiO4)3

Colors: light to dark green, light to dark yellow to reddish brown, occasionally translucent to opaque pink. It is also but rarely found in colorless form

Hardness: 7-7.5

Formation: Cubic crystals

Principal Sources: Worldwide

Special Notes: The garnet group includes a group of minerals that have been used since the Bronze Age as gemstones and abrasives. The name “garnet” may come from either the Middle English word gernet meaning ‘dark red’, or the Latin granatus (“grain”), possibly a reference to the Punica granatum (“pomegranate”), a plant with red seeds similar in shape, size, and color to some garnet crystals. Garnet occurs in metamorphic and igneous rocks worldwide. Grossular or grossularite is a calcium-aluminium mineral species of the garnet group. The name grossular is derived from the botanical name for the gooseberry, grossularia, in reference to the green garnet of this composition that is found in Siberia. Other shades include cinnamon brown (cinnamon stone variety), red, and yellow.